3
7
8
1
4
6
1
8
2
5
9
4
3
1
4
1
6
6
5
2
3
7
9

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple, Empty Rectangle techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 8 / Column 8 → 6 (Hidden Single)
  2. Row 4 / Column 4 → 1 (Hidden Single)
  3. Row 9 / Column 5 → 1 (Hidden Single)
  4. Row 7 / Column 8 → 1 (Hidden Single)
  5. Row 2 / Column 9 → 6 (Hidden Single)
  6. Row 1 / Column 8 → 4 (Hidden Single)
  7. Row 9 / Column 9 → 4 (Hidden Single)
  8. Row 8 / Column 1 → 5 (Hidden Single)
  9. Row 3 / Column 2 → 1 (Hidden Single)
  10. Row 5 / Column 1 → 1 (Hidden Single)
  11. Row 3 / Column 9 → 3 (Hidden Single)
  12. Row 9 / Column 7 → 5 (Hidden Single)
  13. Row 8 / Column 2 → 2 (Hidden Single)
  14. Row 2 / Column 2 → 9 (Naked Single)
  15. Row 8 / Column 6 → 9 (Hidden Single)
  16. Row 8 / Column 5 → 8 (Naked Single)
  17. Row 8 / Column 4 → 4 (Full House)
  18. Row 1 / Column 4 → 8 (Hidden Single)
  19. Row 9 / Column 1 → 8 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 7 in b3 => r56c7<>7
  21. Locked Candidates Type 1 (Pointing): 7 in b7 => r56c3<>7
  22. Locked Candidates Type 2 (Claiming): 7 in r5 => r4c56,r6c456<>7
  23. Row 3 / Column 4 → 7 (Hidden Single)
  24. Row 1 / Column 7 → 7 (Hidden Single)
  25. Naked Pair: 2,8 in r57c9 => r1c9<>2, r4c9<>8
  26. Naked Triple: 4,5,6 in r135c3 => r6c3<>4, r6c3<>6
  27. Empty Rectangle: 2 in b2 (r26c8) => r6c5<>2
  28. Naked Triple: 3,5,6 in r46c5,r6c4 => r46c6<>3, r5c5<>6
  29. Row 4 / Column 6 → 8 (Naked Single)
  30. Row 4 / Column 2 → 7 (Naked Single)
  31. Row 6 / Column 2 → 8 (Full House)
  32. Row 4 / Column 8 → 5 (Naked Single)
  33. Row 2 / Column 8 → 2 (Naked Single)
  34. Row 6 / Column 8 → 7 (Full House)
  35. Row 4 / Column 9 → 9 (Naked Single)
  36. Row 2 / Column 6 → 3 (Naked Single)
  37. Row 2 / Column 4 → 5 (Full House)
  38. Row 6 / Column 4 → 3 (Full House)
  39. Row 3 / Column 7 → 9 (Naked Single)
  40. Row 1 / Column 9 → 5 (Full House)
  41. Row 9 / Column 6 → 7 (Naked Single)
  42. Row 7 / Column 5 → 3 (Full House)
  43. Row 9 / Column 3 → 3 (Full House)
  44. Row 4 / Column 5 → 6 (Naked Single)
  45. Row 4 / Column 1 → 3 (Full House)
  46. Row 6 / Column 3 → 9 (Naked Single)
  47. Row 3 / Column 5 → 2 (Naked Single)
  48. Row 1 / Column 5 → 9 (Full House)
  49. Row 1 / Column 3 → 6 (Naked Single)
  50. Row 1 / Column 1 → 2 (Full House)
  51. Row 7 / Column 1 → 9 (Naked Single)
  52. Row 7 / Column 3 → 7 (Full House)
  53. Row 6 / Column 5 → 5 (Naked Single)
  54. Row 5 / Column 5 → 7 (Full House)
  55. Row 3 / Column 1 → 4 (Naked Single)
  56. Row 3 / Column 3 → 5 (Full House)
  57. Row 5 / Column 3 → 4 (Full House)
  58. Row 6 / Column 1 → 6 (Full House)
  59. Row 5 / Column 6 → 2 (Naked Single)
  60. Row 6 / Column 6 → 4 (Full House)
  61. Row 6 / Column 7 → 2 (Full House)
  62. Row 5 / Column 9 → 8 (Naked Single)
  63. Row 5 / Column 7 → 6 (Full House)
  64. Row 7 / Column 7 → 8 (Full House)
  65. Row 7 / Column 9 → 2 (Full House)
Show More...